Prix correctly? I went to a friend of mine who happens to be a mechanic, and he replaced a wheel bearing for me at his shop. Soon afterwards, I noticed the same "whirring" sound...

"Could it be something else?" I wondered... So I went back to the friend and he said it could just be a bad part, so he ordered another one and we "replaced" the newer wheel bearing again. I drive away and test it, same problem! "Maybe it's not the wheel bearing" I thought... So we switched the 2 front wheel bearings to see if the problem switched sides, and wouldn't you know it, my right tire has a "whirring" sound now. So, obviously the problem IS the wheel bearing. I used an aftermarket part, so we thought maybe at this point we should get an AC Delco one so we KNOW the part is good. We just replaced it again, and it's STILL making this stupid noise!

As you can tell, this is driving me crazy. I've noticed on several sites that people sometimes use a torque wrench when dealing with wheel bearings. . .

This is a part that HAS to be torqued to specs to the vehicle.

If you overtighten it you ruin it
if it is not tight enough it will be damaged.

Also did he inspect the hub for grooves wear?

That could also be an issue